Given the task definition and input, reply with output. In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

Achlorhydria , also known as hypochlorhydria , refers to states where the production of hydrochloric acid in gastric secretions of the stomach and other digestive organs is absent or low , respectively .

Achlorhydria and hypochlorhydria is when there is very little , or no gastric acid in the stomach .